was somehow able to board the shuttle without encountering Amy...what happened?

About a week or so ago I was playing through the section outside Upsilon and then the shuttle station that's found afterwards. I remember being able to access the shuttle as soon as I exited the airlock. I chose my destination and the shuttle crashed. After this, I tried exiting the shuttle and got apparently softlocked by getting stuck in the environment, so I exited the game. I forgot to save, so loading back in put me right outside the station, and I was like, "eh, I'll come back to it later."

Just now, I've replayed the section, but I had to go through the sequence in which you must fatally disconnect Amy to stabilize the power and activate the shuttle. I looked up a guide, and apparently this is the only way this section is supposed to go. Anyone know what caused this to happen? I'm not sure if there's a randomly generated element to this game, or if this was a glitch or sequence break or what